NASA | JPL-Caltech | GSFC | 2017 May 11
[img3="The atmosphere of the distant “warm Neptune” HAT-P-26b, illustrated here, is unexpectedly primitive, composed primarily of hydrogen and helium. By combining observations from NASA’s Hubble and Spitzer space telescopes, researchers determined that, unlike Neptune and Uranus, the exoplanet has relatively low metallicity, an indication of the how rich the planet is in all elements heavier than hydrogen and helium. Credits: NASA/GSFC"]https://www.jpl.nasa.gov/images/spitzer ... 511-16.jpg[/img3][hr][/hr]A study combining observations from NASA's Hubble and Spitzer space telescopes reveals that the distant planet HAT-P-26b has a primitive atmosphere composed almost entirely of hydrogen and helium. Located about 437 light-years away, HAT-P-26b orbits a star roughly twice as old as the sun.
The analysis is one of the most detailed studies to date of a "warm Neptune," or a planet that is Neptune-sized and close to its star. The researchers determined that HAT-P-26b's atmosphere is relatively clear of clouds and has a strong water signature, although the planet is not a water world. This is the best measurement of water to date on an exoplanet of this size.
The discovery of an atmosphere with this composition on this exoplanet has implications for how scientists think about the birth and development of planetary systems. Compared to Neptune and Uranus, the planets in our solar system with about the same mass, HAT-P-26b likely formed either closer to its host star or later in the development of its planetary system, or both. ...
Primitive atmosphere discovered around ‘Warm Neptune’
University of Exeter | 2017 May 11
HAT-P-26b: A Neptune Mass Exoplanet with a Well Constrained Heavy Element Abundance - Hannah R. Wakeford et al
- Science 356(6338):628 (12 May 2017) DOI: 10.1126/science.aah4668